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Montana Field Guide

Montana Field Guides

Lace Foam-flower - Tiarella trifoliata
Other Names:  Tiarella unifoliata

Native Species

Global Rank: G5
State Rank: S4S5
C-value: 5

Agency Status


External Links

General Description
Rhizomatous perennial. Stems, glandular above, 15–50 cm. Leaves mostly basal, petiolate, sparsely hairy; broadly ovate, cordate, 3–8 cm wide, 3- to 5-lobed, crenate. Inflorescence a narrow, glandular, open panicle. Flowers nodding perfect, 5-merous; calyx irregularly cup-shaped with erect lobes 1–3 mm long; petals white, linear, 2–3 mm long, quickly falling; stamens 10, exserted, unequal, ovary superior. Fruit a capsule with 2 unequal, ovoid chambers, 4–6 and 7–10 mm long; seeds 1 per chamber (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
AK south to CA, ID and MT (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1039

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Relative Density



(Observations spanning multiple months or years are excluded from time charts)


  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Simanonok, M. 2018. Plant-pollinator network assembly after wildfire. Ph.D. Dissertation. Bozeman, MT: Montana State University. 123 p.
    • Simanonok, M.P. and L.A. Burkle. 2019. Nesting success of wood-cavity-nesting bees declines with increasing time since wildfire. Ecology and Evolution 9:12436-12445.
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Citation for data on this website:
Lace Foam-flower — Tiarella trifoliata.  Montana Field Guide.  .  Retrieved on , from